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From |
"Siyam,AA (pgr)" <A.A.Siyam@lse.ac.uk> |

To |
<statalist@hsphsun2.harvard.edu> |

Subject |
st: RE: Re: Formatting variables |

Date |
Thu, 13 Jun 2002 19:24:13 +0100 |

My great thanks to Mark Schaffer and Marcela Perticara, both offering perfect solutions. Amani -----Original Message----- From: Marcela Perticara [mailto:perticara@econ.tamu.edu] Sent: 13 June 2002 19:12 To: statalist@hsphsun2.harvard.edu Subject: st: Re: Formatting variables You can also use the substring function. qui gen str9 hhid=substr(snid,1,1)+"0"+substr(snid,2,7) Also keep in mind that you can check the length of the string in a previous command, and only execute this line for the observations or files where the string has eight digits instead of nine. -----Original Message----- From: Mark Schaffer [mailto:M.E.Schaffer@hw.ac.uk] Sent: 13 June 2002 18:55 To: statalist@hsphsun2.harvard.edu; Siyam,AA (pgr) Subject: Re: st: Formatting variables Amani, Whenever you're dealing with identifiers, you should create variables as doubles. What's happening to the last couple of digits may just be rounding error resulting from the fact that floats don't have enough digits of accuracy for what you're doing. Cheers, Mark ----- Original Message ----- From: "Siyam,AA (pgr)" <A.A.Siyam@lse.ac.uk> To: <statalist@hsphsun2.harvard.edu> Sent: Thursday, June 13, 2002 12:51 PM Subject: st: Formatting variables > Dear Stata-listers, > > I am sorry to bother you with, but I have checked the FAQ contents and have spent a few hours now trying to understand what STATA is doing with the following: > > basically I have an identification variable "snid" that should be made-up of 9 digits, arranged as follows > digit 1 = Oblast no. (1 to 8) > digits 2-3=rayon no. (01 to 09) > digits 4-5=population point (01 to 55) > digits 6-7=segment no. (01 to 18) > digits 8-9=household number (01 to 20) > > Instead for some of the files I have, "snid" coming out with 8 digits as a result of bad coding ( rayon number above should have been stored as 01 to 09 but instead was entered as 1 to 9). What I thought I could do was the following > > . destring id, gen(snid) float > . format snid %9.0f > . gen hhid=100000000 + (snid-10000000) > . format hhid %9.0f > . list snid hhid > snid hhid > 1. 11010101 101010104 > 2. 11010102 101010104 > 3. 11010103 101010104 > 4. 11010104 101010104 > ... > 24. 11010401 101010400 > 25. 11010402 101010400 > 26. 11010403 101010400 > 27. 11010404 101010400 > 28. 11010405 101010408 > 29. 11010406 101010408 > > I can see that "zero" has been added, I can't understand why is STATA changing the last two digits of the newly created variable "hhid" . > > Many thanks for your help in advance. > > Amani > * > * For searches and help try: > * http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

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